17. Where a party to the action requests for commissions, reports, certified copies and discovery of documents

issue commissions;

call for reports from persons having special and independent knowledge of facts;

make order for the discovery, production, inspection or admittance of the genuineness of documents by any party thereto of the documents in his possession or power;

make order for the issuance of certified copies of any documents in the custody of any public officer, public corporation, Provincial Council, any local authority, bank, board, body corporate or unincorporate, partnership, hospital, medical institute, court, tribunal or any such similar institution; or

make such other appropriate orders in respect of the discovery of documents in the possession of any third party as he may think fit or desirable on any matter where the parties are at variance.