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5    oossist of one chief of bureau and a board of osaroinere, to con-

6    piat of tbreo merobers, to bc ooro|>oscd of oompetent, sciontific

7    and mechaaical pcrsons, wltose attainments or experieace may

8    qnalify thom for the duty. The rank of the chief of bureau and

9    of tbe board of esamining oflicera to be deterinincd by the PrCB-

10    ident, who may assign officcrs now in servico to thosc duties, or

11    make origirat appomtmcnts. os he may dccm bc3t,

1    Sao. 2. Ił shall bo the duty of the bureau hereby organizod,

2    to exajniue all inrentions, plans and enterprises which may bo of S value in offensivo or defenBire warfaro, and to cause to be test-

4    od, by actual experiment, soch as may requiro it, and are 80 far

5    approved by the President or board of esatoining officers, as to

6    warrant the expenditure for such practical test; and whenever

7    any inyeation, plan or entorpriso shall have boen so csamined

8    or approved, it shall bo the duty of the bureau to proyide for

9    its efhcient application; and for that purposo it shall have power

10    and authority to make all neccssary contracts for the construc-

11    tion or purchase of all necessary deyices, materiale and imple*

12    ments; and it shall bo tho duty of all other departments and bu-

13    reaus to answer all reąuieitions upon them, by the proper offi-

14    cera of the bureau of socrot seryice, when it cau be done with-

15    out serions detrimeDt to other branchee of tbe public seryice;

16    and to employ agenta and experts in like manner as other dcpart-

I    *

17    ments and bureaus ef the goyemment; and the forms and regu-