Pennypacker, Levis Passmore, 1864-1901, American engineer. 



American Society of Civil Engineers. Transactions. 1901. v. 46, 



p.570-571 r 620.5 A51 V.46 



Penrose, Francis Cranmer, 1817-1903, English astronomer and architect. 



Athenaeum. 1903. v.121, p.249 qr 072 A86 v.121 



Royal Society of London. Proceedings. 1904-05. v.75, 



P.30S-309 r 506 RSipr v.75 



Penrose, Richard Alexander Fullerton, 1827-1908, American physician 

 and teacher of medicine. 



American Philosophical Society. Proceedings. 1909. v.48, p.Lvm- 

 Lxi r 506 A512 v.48 



Pepper, William, 1843-98, American physician and scientist. 



Century. 1901. v.6i, p.579-581 r 051 S431 v.6i 



Popular science monthly. 1899. v.55, p.836-842 r 505 P81 v.55 



Thorpe. William Pepper. 1904 92 P4i8t 



*Percy, John, 1817-89, English metallurgist. 



Royal Society of London. Proceedings. 1889. v.46, 



p.xxxv-XL r 506 R8ipr v.46 



Peregrinus, Petrus, //. 1269, French physicist. 



Potamian. Makers of electricity. 1909. p. 12-28 925 P84 



*Perkin, Sir William Henry, 1838-1907, English chemical manufacturer. 



Fortunes made in business. 1884. v.2, p. 295-324 926 F79 v.2 



Pioneers of progress. [1910.] p.117-136 926 P64 



Roberts. Famous chemists. 1911. p.220-231 925.4 R53 



Royal Society of London, Proceedings. 1908. v.8oA, 



p.xxxviii-Lix r 506 R8ipr v.8oA 



Perkins, Jacob, 1766-1849, American inventor. 



Howe. Lives of eminent mechanics. 1857. p. 190-194 926 H85 



Littell's living age. 1849. v.23, p.126-128 r 051 L74 v.23 



Perrine, Frederick Auten Combs, 1862-1908, American electrical engineer. 

 American Society of Mechanical Engineers. Transactions. 1908. 



V.30, p.1222-1224 r 621.05 A5123 V.30 



*Perry, John, 1670-1732, English engineer. 



Smiles. Lives of the engineers. 1874. v.i, p.103-117 926 S64I v.l 



Perry, John Bulkley, 1825-72, American geologist. 



American Academy of Arts and Sciences. Proceedings. 1874. v.9, 



p.321-323 qr 506 A5122P v.g 



Perry, Stephen Joseph, 1833-89, English astronomer. 



The Month. 1890. v.68, p.305-323, 474-488 r 282.05 M86 v.68 



Popular science monthly. 1897. v.50, p.835-840 r 505 P81 v.50 



Royal Society of London. Proceedings. 1890. v,48, 



p.xii-xv r 506 R8ipr v.48 



Peters, Christian Heinrich Friedrich, 1813-90, German astronomer. 



American Academy of Arts and Sciences. Proceedings. 1891. v.26, 



p.373-374 qr 506 A5122P v.26 



120 



