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To SAMUEL RHOADS, Esq. Containing the Method of covering Houses with Copper. DEAR FRIEND,

London, June 26, 1770. It is a long time since I had the pleasure of hearing from you directly. Mrs. Franklin has, indeed, now and then acquainted me of your welfare, which I am always glad to hear of. It is I fear partly, if not altogether, my fault that our correspondence has not been regularly continued. One thing I am sure of, that it has been from no want of regard on either side, but rather from too much business, and avocations of various kinds, and my having httle of importance to communicate.

One of our good citizens, Mr. Hillegas, anxious for the future safety of our town, wrote to me some time since, desiring I would inquire concerning the covering of houses here with copper.

I sent him the best information I could then obtain, but have since received the enclosed from an inge

I « The carpentry of the roof being formed with its proper descent, is, in the first place, sheeted or covered with deals, nailed horizontally upon the rafters, after the same manner as when intended to be covered with lead. The sheets of the copper for this covering are two feet by four, and for covering the slopes of the roof are cast so thin as to weigh eight or nine pounds, and for covering the flats or gutters, ten or eleven pounds each, or about one pound, or a pound and a quarter to the superficial foot.

A string of strong cartridge paper (overlapping a little at its joints) is regularly tacked down upon the sheeting of wood, under the copper covering, as the work proceeds from eaves to ridge. It prevents the jingling sound of hail or rain falling upon the roof, and answers another purpose, to be mentioned by-and-bye.

" In order to show the regular process of laying down the roof, we must begin with fastening two sheets together lengthwise. The edges

nious friend, who is what they call here a civil engineer. I should be glad you would peruse it, think of the matter a

of two sheets are laid down so as to lap or cover each other an inch, and a slip of the same copper, about three and a half inches broad, called the reeve, is introduced between them. Four oblong holes or slits, are then cut or punched through the whole, and they are fastened or riveted together by copper nails, with small round shanks and dat heads. Indents are then cut 17 inch deep upon the seam at top and bottom. The right-hand sheet and the reeve are then folded back to the left. The reeve is then folded tc the right, and the sheets being laid on the roof in their place, it is nailed down to the sheeting with flatheaded short copper nails. The right-hand sheet is then folded over the reeve to the right, and the whole beat down flat upon the cartridge paper covering the sheeting, and thus they are fastened and laid in their places, by nailing down the reeve only; and by reason of the oblong holes through them and the reeve, have a little liberty to expand or contract with the heat and cold, without raising themselves up from the sheeting, or tearing themselves or the fastening to pieces. Two other sheets are then fixed together, according to the first and second operations above, and their seam, with the reeve, introduced under the upper ends of the seam of the former, so as to cover down about two inches upon the upper ends of the former sheets; and se far the cartridge paper is allowed to cover the two first sheets. This edge of the paper is dipt in oil, or in turpentine, so far before its applia, cation, and thus a body between the sheets is formed impenetrable to wet: and the reeve belonging to the two last sheets is nailed down to the sheeting as before, and the left-hand sheet is turned down to the right. Four sheets are now laid down, with the seam or joint rising to the ridge; and thus the work is continued, both vertically and horizontally, till the snof be covered, the sides and ends of each sheet being alternately each way, undermost and uppermost.

“ The price for copper, nails, and workmanship, runs at about eight pounds ten shillings per cwt., or two shillings and threepence per foot superficial, exclusive of the lappings; and about two shillings and eightpence per foot upon the whole; which is rather above half as much more as the price of doing it well with lead.”

little, and give me your sentiments on it. When

you

have done with the paper, please to give it to Mr. Hillegas. I am told by Lord Le Despencer, who has covered a long piazza, or gallery, with copper, that the expense is charged in this account too high, for his cost but one shilling and tenpence per foot, all charges included. I suppose his

copper must have been thinner. And, indeed, it is so strong a metal, that I think it may well be used very thin..;

It appears to me of great importance to build our dwelling houses, if we can, in a mapuer more secure from danger by fire. We scarcely ever hear of fire in Paris. When I was there, I took particular notice of the construction of their houses, and I did not see how one of theni could well be burnt. The roofs are slate or tile, the walls are stone, the rooms generally lined with stucco or plaster, instead of wainscot, the floors of stucco, or of six-sided tiles painted brown, or of flag stone, or of marble ; if any floors were of wood, they were of oak wood, which is not so inflammable as pine. Carpets prevent the coldness of stone or brick Hoors offending the feet in winter, and the noise of treading on such floors, overhead, is less inconvenient than on boardis. The stairs too, at Paris, ' are either stone or brick, with only a wooden edge or corner for the step; so that, on the whole, though the Parisians commonly burn wood in their chimnies, a more dangerous kind of fuel than that used here, yet their houses escape extremely well, as there is little in a room that can be consumed by fire except the furniture ; whereas in London, perhaps scarcely a year passes in which half a million of property and many lives are not lost by this destructive element. Of late, indeed, they begin here to leave off wainscoting their rooms, and instead of it cover the walls with stucco, often formed into pannels, like wainscot, which, being painted, is very strong and warm. Stone staircases too,

with iron rails, grow more and more into fashion here. But stone steps cannot, in some circumstances, be fixed; and there, methinks, oak is safer than pine ; and I assure you, that in many genteel houses here, both old and new, the stairs and floors are oak, and look extremely well. Perhaps solid oak for the steps would be still safer than boards; and two steps might be cut diagonally out of one piece. Excuse my talking to you on a subject with which you must be so much better acquainted than I am. It is partly to make out a leta ter, and partly in hope that by turning your attention to the point, some methods of greater security in our future building may be thought of and promoted by you, whose judgment I know has deservedly great weight with our felloweitizens. For though our town has not hitherto suffered very greatly by fire, yet I am apprehensive that some time or other, by a concurrence of unlucky circumstances, such as dry weather, hard frost, and high winds, a fire then happening may suddenly spread far and wide over our cedar roofs, and do us immense mischief.: I am yours, &c.

B. FRANKLIN.

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To GOVERNOR FRANKLIN, New Jersey.
On Exercise of the Body.

London, August 19, 1772. * * * In yours of May 14th, you acquaint me with your indisposition, which gave me great concern. The resolution you have taken to use more exercise is extremely proper ; and I hope you will steadily perform it. It is of the greatest importance to prevent diseases, since the cure of them by physic is so very precarious. In considering the different

... Dr. Branklin's son, to whom the first part of the Memoirs of His LIER is addressed.

kinds of exercise, I have thought that the quantum of each is to be judged of, not by time or by distance, but by the degree of warmth it produces in the body: thus, when I observe if I am cold when I get into a carriage in a morning, I

inay ride all day without being warmed by it; that if on horseback

my

feet are cold, I may ride some hours before they become warm ; but if I am ever so cold on foot, I cannot walk an hour briskly, without glowing from head to foot by the quickened circulation : I have been ready to say, (using round numbers without regard to exactness, but merely to make a great difference) that there is more exercise in one mile's riding on horseback, than in five in a coach ; and more in one mile's walking on foot, than in five on horseback; to which I may add, that there is more in walking one mile up and down stairs, than in five on a level floor. The two latter exercises may be had within doors, when the weather discourages going abroad; and the last may be had when one is pinched for time, as containing a great quantity of exercise in a handful of minutes. The dumb bell is another exercise of the latter compendious kind; by the use of it I have in forty swings quickened my pulse from sixty to one hundred beats in a minute, counted by a second watch ; and I suppose the warmth generally increases with quickness of pulse.

B. FRANKLIN

To Mr. ANTHONY BENEZET,' PHILADELPHIA.

On the Slave Trade. DEAR FRIEND,

London, August 22, 1772. I made a little extract from yours of April 27, of the number of slaves imported and perishing, with some

'An American philanthropist. In 1767, he wrote a Caution to Great Britain and her Colonies, in a short representation of the cala

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